Jack



FIG. 1 is a front view of the jack of the invention;

FIG. 2 is a right side view of the jack depicted in FIG. 1;

FIG. 3 is a left side view of the jack depicted in FIG. 1;

FIG. 4 is a top view of the jack depicted in FIG. 1;

FIG. 5 is a rear view of the jack depicted in FIG. 1; and,

FIG. 6 is a perspective view of the jack depicted in FIG. 1. 

The ornamental design for a jack, as shown. 